I have a Mac Pro 5,1 2012 and just installed an AMD RX580 GPU. The sound doesn't go through the HDMI so I have to plug into the headphone outlet on the front of the computer (and can't use the speakers on my monitor).
This post says HDMI doesn't work on non-native GPUs and suggests reading this. I have Mojave installed and would like some advice on what's the easiest way to get HDMI setup. Looks like there are several ways. I'd prefer the easiest and least complicated/invasive method. Has anyone tried this?